/*
 * Copyright 2016 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.things.contrib.driver.apa102;

import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;

import java.util.Arrays;

public class BytesMatcher extends BaseMatcher<byte[]> {
    private byte[] mExpectedBytes;

    BytesMatcher(byte[] expectedBytes) {
        mExpectedBytes = expectedBytes;
    }

    public static BytesMatcher contains(byte... expectedBytes) {
        return new BytesMatcher(expectedBytes);
    }

    @Override
    public void describeTo(Description description) {
        description.appendText(Arrays.toString(mExpectedBytes));
    }

    @Override
    public boolean matches(Object item) {
        byte[] spiData = (byte[]) item;
        for (int i = 0; i < spiData.length - mExpectedBytes.length + 1; i++) {
            int j;
            for (j = 0; j < mExpectedBytes.length; j++) {
                if (spiData[i+j] != mExpectedBytes[j]) {
                    break;
                }
            }
            if (j == mExpectedBytes.length) {
                return true;
            }
        }
        return false;
    }
}
